My niece, MT, graciously allowed me to use one of the photos she took in 2007 during a visit to Huế. Here’s how it looks for the Kindle version of the book, and the cover for the print version is almost the same:

I had no idea where she had taken the shot, until a friend of mine, NVH, sent me the following photo which he said was taken at Emperor Thiệu Trị’s library. Note the mandarin statue on the left side of the photo.

Finally, today he sent me another photo to put everything in perspective. You can barely see it, but look at the left corner of the lower roof.